Here are some podcasts I've enjoyed lately:
Lots of good stuff from Scientific American's 60-Second Science:
"Life Origin Experiment Gets Better with Age"
"Brain Seeks Patterns Where None Exist"
"Rocks from Earth's Origins"
"Amateurs Help Pro Astronomers Sort Galaxies"
"Air Fresheners' Unlisted Ingredients"
"Google-Style Rankings for Ecosystems"
"Solar Powered Fuel Cells"
and I can't remember if I linked to this one, but it's great & a lot more likely to come true under a reality-based administration like Obama's:
"A Bill of Rights for Scientists"